Hi Everyone,

We added ChaCha8, ChaCha12 and ChaCha20 this afternoon. I could not find 
test vectors for the seek operation, so its currently disabled and throws a 
NotImplemented() exception.

Commits at:

  * 
http://github.com/weidai11/cryptopp/commit/53b51331a4e1d9664bc93a0f1597fc2e70506234
  * 
http://github.com/weidai11/cryptopp/commit/38f6c33789e1a029595564dd5663622b15410d35
  * 
http://github.com/weidai11/cryptopp/commit/90bb31360d556d182bb8e4c9e24901563d64878c

There are no self tests, but there are test vectors. the test vectors can 
be run with:

    ./cryptest.exe tv all    # All test vectors
    ./cryptest.exe tv chacha    # ChaCha8, ChaCha12 and ChaCha20

There's an opportunity for an SSE2 implementation if anyone is interested. 
Salsa20 has and its inline ASM had too many problems with the GCC 5.x 
compilers, so I did not want to copy/paste it and then endure the subtle 
bugs. If anyone has time for an SSE2 implementation using intrinsics 
(_mm_X), then I'd be happy to check it in.

Jeff

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